The Powell Building was designed by Carrere & Hastings and erected in 1892. It was converted to Co-ops in 1970. Bone/Levine Architects first inspected  the building in 1999. The results of the inspections, concluded that many of the terra cotta and limestone ornamental elements were fatigued and required reconstruction.he project included restoration of cast iron columns, lintels, and sill reconstruction; masonry repairs, re-pinning and pointing of stone and terra cotta; and reconstruction of the ornamental copper cornice. The building also chose to do a full window replacement program with high quality, historically precise architectural wood windows. There are over fifty different window types on this building. A new phase of terra cotta restoration is in progress (2023).